{
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    "abstract": "IPv4 fragmentation is not sufficiently robust for use under some conditions in today's Internet. At high data rates, the 16-bit IP identification field is not large enough to prevent frequent incorrectly assembled IP fragments, and the TCP and UDP checksums are insufficient to prevent the resulting corrupted datagrams from being delivered to higher protocol layers. This note describes some easily reproduced experiments demonstrating the problem, and discusses some of the operational implications of these observations. This memo provides information for the Internet community.",
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    "authors": [
      {
        "name": "John Heffner"
      },
      {
        "name": "Matt Mathis"
      },
      {
        "name": "Ben Chandler"
      }
    ],
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      "confidence": "high",
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      "updated": "2026-10-16T15:47:29.897Z",
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      "confidence": "high",
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      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
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    "docLabel": "IETF RFC 4963",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
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    "docNumber": "4963",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docTitle": "IPv4 Reassembly Errors at High Data Rates",
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      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docType": "Informational",
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      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "doi": "10.17487/RFC4963",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "href": "https://doi.org/10.17487/RFC4963",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "pages": "10",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publicationDate": "2007-07-01",
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      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "references": {
      "bibliographic": [
        "RFC2923",
        "RFC791",
        "RFC1191",
        "RFC2460",
        "RFC2960",
        "RFC4251",
        "RFC4301",
        "RFC4302",
        "RFC4459",
        "RFC4821",
        "orphan/RFC4963/h:01d67728",
        "orphan/RFC4963/h:5fb502bc",
        "orphan/RFC4963/h:d2135d38",
        "orphan/RFC4963/h:60be7c96",
        "orphan/RFC4963/h:0669773b"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=15 proseBlocks=21 skippedAnchorBlocks=17",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
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        "version": "extractDocs.js@commit:e0fe4a71cd26"
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    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc4963/",
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      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
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      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
      "updated": "2026-10-16T15:47:29.897Z",
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      "active": true,
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
        "updated": "2026-10-16T15:47:29.897Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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      "errataExist": false,
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        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
        "updated": "2026-10-16T15:47:29.897Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
        "updated": "2026-10-16T15:47:29.897Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "statusNote": "Informational",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
        "updated": "2026-10-16T15:47:29.897Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4963/",
        "updated": "2026-10-16T15:47:29.897Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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}